#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
    int  a = 1;
    int* p = &a;
    printf("%d\n", a);
    printf("%d\n", *p);
    *p = 20;
    printf("%d\n", a);
    printf("%d\n", *p);
    printf("%p\n", &a);
    printf("%p\n", p);
    return 0;
}